Strainer



Nov. 8, 1932.

J. s. MOHR 1,886,893

STRAINER Filed April 8. 1932 2 Sheets-Sheet l I l l I HI! Nov. 8, 1932. J MQHR 1,886,893

STRAINER Filed April 8, 19:2 2 Sheets-Sheet 2 Patented Nov. 8, 1932 UNITED STATES PATENT OFFICE JOSEPH S. MORE, OF CHICAGO, ILLINOIS, ASSIGNOB'TO JOHN HOHR & SONS, OI CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS STRAINER Application filed Apri18, 1932. Serial No. 603,982.

My invention pertains to screens, sieves, filters, and the like, and while structures incorporating the invention have varied uses, they are perhaps especially, though not restrictedly, adapted for satisfactory employment in straining granulated slag from water.

An aim of the invention is to provide a construction of this general character which is simple in structure, which is relatively economical to manufacture, which performs its functions efficiently and satisfactorily, which is unlikely to become damaged or injured in ordinary service, except through the usual wear and tear of operating mechanisms, which lends itself to easy repair, which is self-cleaning, etc. 7

To the accomplishment of these and other desirable objects and purposes, I have dei signed the present, preferred embodiments of the invention presented in the accompanying drawings forming a part of this specification and to which reference should be had in connection with the following detailed description, and in these drawings, for simplicity, like reference numerals have been employed to designate the same parts throughout the several views. In these drawings: a Figure 1 is a longitudinal, vertical section through the appliance on line 1-1 of Figure 2, l a Figure2is a vertical cross-sectlon on line 22 of Figure 1; and

Figure 3 is a fragmentary view similar to the upper portion of Figure 2 of a somewhat bearings v14,1151;carried on a suitable support or tubular shaft 13 and suc or foundation 15, the shaft or tubular member also having a gear 16 thereon by means of which it may be rotated by mechanism not shown, such, for example, as an electricmotor or its equivalent. 5 The part of such tubular shaft which projects inside of the receptacle or tank has a spider tight or keyed thereon so that it will rotate with theshaft, such spider comprising a hub portion 17 fitting the shaft and anum- 6o ber of radiating, tapered arms or ribs 18, 18- I to which a circular, metal end-plate 19 is fastened by bolts, rivets, welding, or otherwise. p

An openwork or skeleton plate 21 in the form of a truncated cone has its larger end positioned over and welded to the verticallyarranged, rotary disc 19, so that it is supported solely by the latter, the plate 21 having parts 22, 22 disposed radially of the 7 structure, oblique stiffening and strengthening brace sections 23, 23, and larger and smaller terminal ring portions 20, 20, all as if clearly illustrated.

The specified cross bracing of such skeleton member takes the torque stresses and constitutes a truss construction which adequately strengthens the structure as a whole.

The smaller-diameter end portions of the conical frame-member 21 is closed by a circular plate 24 welded thereto, the element 24 having a central hole normally covered by a removable or demountable closure-disc 25, which permits access to the inside of the mechanism when occasion requires. 35

A screen or sieve 26 of an appropriate mesh, preferably in independent, removable sections reaching from one part 22 to the next one, covers the entire outer or peripheral surface 'of the supporting, s10 ing, tapered '90 frame 21, and, outside of such ivlded screen or sieve, scoop-shaped vanes or ribs 27 are removably secured, as by bolts, in register with the radial sections 22 of such frame,

whereby they are properly supported to per form their work.

A stationary, inlet water-pipe 28 extends through the center of the lar er, rotary pipe innerpipe is supported, at least in part, by a bearing 29 through which it extends and which is mounted inside of, fastened to, and revolved by the larger, outside pipe or shaft.

The inner end of such pipe 28 is connected by a curved pipe 31 to a spray-nozzle 32 located just inside of or beneath the upper part of the annular screen, inclined in the same direction and to the same degree as such section of the screen or strainer, and sloping somewhat sidewise, as shown.

The bending or curving of the pipe or conduit 31 locates the reaction forces acting on the nozzle in desired and eflicient relation to the bearing 29.

Adjacent to such top portion of the strainer and at its smaller end, a receptacle or trou h 33 is located in suitable position or relatlon to the revolving screen or strainer to perform its function hereinafter specified.

Assuming that the reservoir 10 is filled to the indicated level by the slag-charged water which continues to flow into it, that the screen is revolving at appropriate speed in the direction indicated with the greater portion of the screen immersed in suc water, and that water is sprayin in suitable amount from the nozzle through that part of the revolving screen directly above it, the differential in water-level at the outside and at the-inside of the screen will create a suction on all inundated surfaces of the screen, causing solids suspended in the water to be attracted to and to adhere more or less to the outside of the screen, the strained or cleared water flowing through the screen to its interior and finding exit through the rotating pipe or tube 13.

The scoop-shaped blades or vanes in passing just above the bottom or floor of the tank 10 remove or scrape away any slag tending to accumulate at such position and whose collection or aggregation at suchlocation would shortly engage or contact with and possibly injure the screen proper were the blades not provided for the specified beneficial purpose.

Such vanes or fins pick up the larger solid particles in the liquid which do not adhere to the screen and carry them up to the top of the appliance at which point they slide down the inclined surface of the screen, being confined and guided by the adjacent blades, so that they drop into the receptacle or trough 33 from which they may be removed in any preferred manner.

Also, the streams or jets of water from the nozzle, playing on the underside of the topmost screen section progressively dislodge the solid matter clinging or cleaving to the outer face of the screen and wash it down the outer surface of the latter into the trough or container 33, which action is facilitated by the guiding cooperation of the proximate outstanding vanes or blades, which. as has been indicated, perform the double function of carrying the largerparticles upwardly with the screen and then successively forming roperly-located chutes to direct the disgharged material into the receptacle provided or it.

In some instances, the water-spray may also assist in removing and delivering the larger unadhered particles of matter.

Thus the novel apparatus may be operated continuously to perform its useful work uninterruptedly by reason of the self or automatic cleaning action of the screen.

In some cases, it may be desirable to position the outstanding blades or vanes at an angle oblique to the corresponding radii to give them more of a scoop or retaining capacity, and such modification has been illustrated fragmentarily in Figure 3.

In this structure, all of the parts are the same as in the construction already described, except that the conical screen-supporting frame 121 is made with its struts 122, 122 35 at the desired angle to the answerin correlated radii, the fins or vanes 127, 12 being mounted on the structure at the same angle, and, in order to give these more of a scoop or holding character, they may be of Z shape and provided with terminal walls at their outer ends only.

Such vanes or fins obviously will act as more effective scoops, pockets or buckets for elevating and retaining the solids until the correct point of discharge is reached, when they act progressively as sides of chutes to guide or direct the material slidin down the screen between them into the troug designed to receive it.

Blades or fins placed at such oblique angles also have a desirable slicing or shearing action on the material resting on the bottom of the tank rather than engaging it all at once throughout the length of the 'blade if such angular disposition is not employed.

From the illustration it will be perceived that at the top of the apparatus, the trough is long enough so that there are always three such blade-constituted chutes above it, and that at all times the section of screen directly above the doubly-inclined nozzle and its chute is in proper position for deliveryQintoitz From what precedes, it will be obvious that the stated objects of the invention have been attained in a simple structure well qualified to perform its functions efiiciently and effectively, and it will be seen that, due to the inclination of the spray-nozzle toward the trough, the particles dislodged from the screen by its jets of water are projected, more or less thereby in a direction somewhat 1ongitudinal of the structure, thus facilitating their discharge down the screen into the receiving trough.

Instead of water being used through such nozzle to clean the screen, jets of air may be employed for a like purpose.

Although the structure has be n shownas having a horizontal axis for the ota v screen,

this may be inclined in more or less degree, if desired.

In the embodiments set forth, all of the bearings for the rotating members are located outside of the main tank, but, obviously, any appropriate bearing construction will suflice WhlCh meets the needsof the particu-' lar situation, yet the illustrated arrangement has the advantage that the bearings are so located as to avoid the abrasive action of the solids in the liquid in the tank.

Although only two incorporationsof the invention in physical form have been specifically referred to, it is to be borne in mind that the invention as defined by the appended claims is susceptible of' a variety of embodiments and that many minor or radical changes may he incorporatedin the structures as described without departure from the heart and essence of the invention and without the loss or sacrifice of any of its substantial benefits and advantages.

I'claim:

1. In a strainer, the combination of a tank adapted to contain the liquid to be strained, a hollow strainer having a screen periphery located to immerse the lower portion of such screen in the liquid of said tank, means to rotate said strainer, means to deliver the strained liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid level in said tank sloping toward said receptacle a direction transverse to the direction of rotation of said strainer, and means to dislodge matter adhering to the outer surface of the top portion of said screen to allow such freed mate] .screen in the liquid of said tank, means to rotate said strainer, means to deliver the strained liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid-level in said tank sloping' toward said receptacle in a direction transverse to the direction of rotation of said strainer, and means inside of said top sloping portion of said strainer to blow fluid through the screen to dislodge matter adhering to its outer surface in order to allow such freed material to pass down said inclined screen surface into said receptacle.

3. In a strainer, the combination of a tank adapted to contain the liquid to be strained, a hollow, strainer having a screen periphery located to immerse its lower portion in the liquid in said tank, means to rotate said strainer, means to deliver the strained liquid from the interior of said strainer, a receptacle,

the top portion of said screen above the liquid-' level in said tank sloping toward said receptacle in a direction transverse to the direction of rotation of said strainer, means inside of said strainer at said top sloping screen portion to blow-fluid through the screen to dislodge matter adhering'to its outer surface in order to allow such freed material to slide down said inclined screen surface into said receptacle, and blades on said strainer projecting outwardly beyond said screen to engage particles in the liquid and carry] them to the top of the screen'fordelivery into said receptacle and to act as guides during dis- 1' charge of material from the screen into the receptacle.

4. In a strainer, the combination of a tank adapted to contain the liquid to be strained, a

hollow strainer with a screen periphery in the form of a truncated cone located to, immerse the lower portion of the screen in the liquid in said tank, means to rotate said strainer,

means to deliver the strained liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid-level in said tank sloping toward said, receptacle in a direction transverse to the direction of rotation of said strainer, means inside of said strainer at said top portion to blow fluid through the screen to dislodge matter-adhering to its outer surface in order to allow such freed material to slide down said inclined S111. face of the screen into said receptacle, and blades on said strainer projecting outwardly beyond said screen to engage particles in said liquid and carry them to the top of the screen for delivery into said receptacle and to act as guides during the discharge of material from p the screen into the receptacle.

5. The structure as presented in claim 3 in which the blades are at an angle oblique to the direction of rotation of the strainer.

6. The structure as presented in claim 4 in which the blades are at an angle oblique to the direction of rotation of the strainer.

7. The structure as presented in claim 2 in which the fluid-blowing means includes a water-spraying nozzle.

8. The structure set forth in claim 2 in which the fluid-blowing means includes a fluid-discharging nozzle arranged oblique to the direction of rotation of the strainer.

9. In a strainer, the combination of a tank adapted to contain the liquid to be strained, a

hollow strainer located to have its lower p'ortion immersed in the li uid of said tank and "120 comprising spaced .en -walls, a peripheral skeleton-frame connecting the outer margins of said end-walls and a screen overlying and supported on said frame, means to rotate said strainer, means to deliver the strained-liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid-level in said-tank sloping toward said rece tacle in a'direction transver to the directlon of rotation of said strainer, nd

means'inside of said strainer at said top sloping portion to blow fluid through the screen to dislodge matter adhering to its outer surface to allow such released material to slide down said inclined surface into said receptacle.

10. In a strainer, the combination of a tank adapted to 7 contain a liquid to be strained, a hollow strainer located to have its lower portion immersed in the liquid in said tank and including spaced end-walls, aperipheral skeleton-frame secured to said endwalls and a screen mounted on said skeletonframe, means to rotate said strainer, means to deliver the strained liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid-level in said tank sloping toward said receptacle in a direction transverse to the direction of rotation of said strainer, means inside of said strainer at said top sloping portion to blow fluid through the screen to dislodge matter adhering to its outer surface to allow such liberated material to slide down said inclined surportion immersed in the liquid in said tank,

larger and smaller said strainer includin spaced end-walls, a s eleton-frame in the form of a truncated cone secured to the margins of said end-walls and a screen overlying and secured to said frame, means to rotate said strainer, means to deliver the strained liquid from the interior of said strainer, a receptacle, the top portion of said screen above the liquid-level in said tank sloping toward said receptacle in a direction transverse to the direction of rotation of said strainer, a fluid nozzle inside of said strainer at such top sloping portion to blow fluid through the screen to dislod e matter adhering to its outer surface in or onto allow such on said pi e and having a screen periphery located to ave its lower portion immersed in the liquid in said tank, means to rotate said pipe and strainer, a receptacle, the top portion of said screen above the liquid-level in said tank sloping toward said receptacle in a direction transverse to the direction of rotation of said strainer, and a nozzle inside of said strainer at said top sloping portion adapted to blow fluid through the screen to dislodge matter adhering to its outer surface in order'to allow such released material to slide down said inclined surface into said receptacle 13. The structure presented in claim 12 in which the screen is in the form of a truncated cone, the structure also havin blades on said strainer projecting outwar y beyond said screen to engage particles in said liquid and carr them to the'top of the screen for delivery into-said rece tacle and to act as guides for the material dlscharging from the screen into the receptacle.

14. In a strainer, the combination of a tank adapted .to contain the liquid to be strained,

bearing-means, a hollowpipe revoluble in said bearing-means and through which the strained liquid is adapted to be discharged, a revoluble hollow strainer mounted on an end of said pipe and comprising a largeriend-wall carried by said pipe, a truncated-cone skeleton-frame mounted at one end on the periphery of said end-wall, a secondend-wall for, and carried by, the other end of said frame,

and a screen covering said frame, means to rotate said pipe and strainer with the lower portion of said screen immersed in the liquid in said tank, a receptacle opposite the top portion of said screen and located to receive material slidin down the'scr'een, and means to free materia adhering to the top part of said screen so that it may slide down the latter into said receptacle.

In witness whereofl have hereunto set my hand. JOSEPH S. MOHR.

liberated material to slidedown said inclined screen surface into saidreceptacle, and blades mounted on said frame and projecting out- 

